Meet Daysy – your personal fertility calculator.

Daysy lets you make the choice!

Daysy is a fertility monitor that uses the fertility awareness method (FAM) by learning & tracking your menstrual cycle. With Daysy, you can plan pregnancy and naturally control your cycle - just as you choose.

Daysy will show you if you are fertile or not with an accuracy of 99.3%. It is all natural and free of side effects.

As easy as 1,2,3...

Just 60 seconds once a day

"I would say that daysy is one of the most fantastic purchases I have ever made! It has taught me to listen to my body and its natural cycle rather than changing it with unnatural methods. I would most definitely recommend this product to my best friend, in fact, I have! "

Natalie, student

"I have already recommended the product and two of my friends have bought Daysy! I love it! I personally dislike birth control pills. They make me.... well, not me. Other birth control methods I have heard first hand horror stories. That one story of each product makes it not worth the risk to me. This is extremely easy to do and extremely easy to remember to do. I use my cell phone as my alarm to wake up, and I keep Daysy on my night stand right next to my phone. I have been using it for the past 7 months and I love it!"

-anonymous

"Daysy allows me to take control of my cycle without hormones or side effects. I can use Daysy and not have to worry about making errors the way I would with the calendar or mucus method alone. I can be confident that I am understanding my body well and being responsible with my future!"

Anonymous, high school math teacher:

"I recommend Daysy to everyone. She and I are good friends. Switching to using Daysy instead of the pill or other hormonal birth control was the best decision I ever made. It helped eliminate the need for not only the pill, but it also helped reduce the postpartum depression I was suffering from, and allowed me to ween off my medication as well. Being in touch with my body is such a wonderful feeling and I feel much more in control of not only my fertility but also my life."

Daysy has an App.

Once Daysy is connected to her app, she will automatically start syncing data with daysyView.

daysyView lets you see your temperature data and fertility prognosis.

Share your data with your loved one, and let them know when it’s the “right” day.

Meet daysyView.

See your daily, weekly and montly status of fertility

See your color - coded monthly calendar

Make notes

See your cycle forecast

See your temperature curve and values

See your fertility and cycle statistics

Share your data with your loved one through daysyView Partner App

Enter sexual intercourse

Get notified when something changes in your cycle

Contact our expert team for advice and support

Get free cycle analysis

The medical basics of a woman's cycle

Every woman is different,

but these are the basic physiological factors to a woman's menstrual cycle that you should know:

Every woman usually only ovulates once per cycle.

If two or more ovulations take place, these would occur within 24 hours.

After ovulation, the egg can be fertilised for a maximum of 18 hours.

Inside the female body, sperm remain able to move and fertilise for a maximum period of 5 days.

This means that a pregnancy can occur on only 6 days, which are the 5 days prior to ovulation and the day of ovulation itself. Daysy calculates these 6 days and displays them to you.

Exactly how does the fertility calculator Daysy work?

Daysy recognizes a woman's ovulation in her cycle through a morning measurement of the basal temperature. Simply measure the temperature under your tongue to know whether you are currently fertile or not. Depending on the phase of your cycle, you will either see a green light or a red light.

Beyond that, Daysy records the course of your cycle and shows you which processes are currently taking place in your uterus. There is hardly a simpler way to attain awareness of your female body.

When comparing Daysy to your alternatives, what makes this cycle monitor so special is that it bears no side-effects: no hormones, no thrombotic risk, or any other accompanying effects. It does not get any better than that!